But the elite referees commission for the German Soccer Association sent a letter to all Bundesliga and Second Bundesliga clubs, reminding them that the Dortmund fun fell under Rule 12 of the league rules (forbidden play and unsporting behavior).

“Under the rules, a player should receive a yellow card, ‘if he covers his head or face with a mask or anything similar,’” according to a release on the association’s website.

The penalty will be a yellow card.

In the release, Herbert Fandel, chairman of the refereeing committee said “emotions belong on the pitch, especially the joy of scoring a goal. We don’t want to seem too inflexible, but we can’t let things go too far.”

Sigh. I guess we’ll have to just content ourselves with Jurgen Klopp celebrations: